You gain access to the PointClicker server through the Entropy Contract system to remove someone's save. Once inside, you have two options.
1) Legitimately click your way through all upgrades.
2) Follow these steps in the terminal. Replace [username] with your username in-game.
cd /PointClicker/Saves
scp Bit.pcsav
Return to your PC.cd /home
mv Bit.pcsav [username].pcsav
Reconnect to PointClicker.cd /PointClicker/Saves
rm [username].pcsav
upload home/[username].pcsav
Back up to the menu and play PointClicker.When you reconnect, you may not be able to click anything because the points are negative. Wait a bit for your negative points to reach an absurd number. Mine was a 14 digit number with only the first two numbers slow enough to read; I did the next step at -70~.
cd /PointClicker/Saves
replace [username].pcsav "-" ""
While this doesn't stop the negative points, it does make your points temporarily positive, giving you the time to buy the final upgrade.